Atmananda, S. (1991). The Four yogas: The four paths to spiritual enlightenment (2nd ed.). Bharatiya Vidya Bhavan.
Chicago Style aipamenaAtmananda, Swami. The Four Yogas: The Four Paths to Spiritual Enlightenment. 2nd ed. Bombay: Bharatiya Vidya Bhavan, 1991.
MLA aipamenaAtmananda, Swami. The Four Yogas: The Four Paths to Spiritual Enlightenment. 2nd ed. Bharatiya Vidya Bhavan, 1991.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.